WO2017111530A1 - 미세하고 균일한 도금 조직을 갖는 도금 강판 및 도금강판 제조 방법 - Google Patents
미세하고 균일한 도금 조직을 갖는 도금 강판 및 도금강판 제조 방법 Download PDFInfo
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- WO2017111530A1 WO2017111530A1 PCT/KR2016/015164 KR2016015164W WO2017111530A1 WO 2017111530 A1 WO2017111530 A1 WO 2017111530A1 KR 2016015164 W KR2016015164 W KR 2016015164W WO 2017111530 A1 WO2017111530 A1 WO 2017111530A1
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- Prior art keywords
- steel sheet
- cooling
- plating
- plating layer
- plated
- Prior art date
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0034—Details related to elements immersed in bath
- C23C2/00342—Moving elements, e.g. pumps or mixers
- C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Definitions
- the present invention relates to a plated steel sheet, and more particularly, to a plated steel sheet and a method of manufacturing a plated steel sheet of good quality having a fine and uniform plating structure produced by rapid cooling.
- the technique of providing corrosion resistance is widely performed by plating a zinc type metal or a metal alloy on the surface of a steel plate.
- the coated steel sheet is increasingly used for exterior construction materials such as home appliances, automobiles, shipbuilding, etc., which require beautiful surface management.
- Continuous Galvanizing Line is a facility for producing galvanized steel by attaching molten zinc to the surface of steel sheet.
- the steel sheet is plated in a plating port containing molten zinc while going through a sink roll disposed in the plating port.
- Molten zinc is attached to the steel plate through the sink roll is turned to the top of the plating port.
- the steel sheet drawn out of the galvanizing port is then made into a plated steel sheet through a process of adjusting the coating amount on the surface of the steel sheet and then cooling the plating layer.
- the present invention provides a plated steel sheet and a plated steel sheet manufacturing method of fine and uniform fine quality.
- the plated steel sheet of the present embodiment may include a Zn-based plating layer formed by hot pressing after hot dip plating on the steel sheet, and the Zn-based plating layer may include a Zn single phase structure having an average particle size of 5 ⁇ m or less.
- the sequin size of the plating layer may be 300 to 500 ⁇ m.
- the plating layer may further include an Mg component, and may include an MgZn 2 phase in the plating layer.
- the ratio (112) / 201 of the MgZn2 phase may be formed to be 0.6 or more.
- the plating layer may be a Zn-Al-Mg alloy plating layer further comprising an Al component.
- the fraction of Zn single phase of the present embodiment may be 15 to 40 area%.
- the Zn single phase distribution in the plating layer of the present embodiment may be uniform with respect to the plating layer thickness direction.
- the Zn single phase distribution B / A in the plating layer may be formed under a condition of 0.5 to 1.0.
- A is the total Zn single phase fraction with respect to the plating layer thickness direction
- B is the Zn single phase fraction in the plating layer outer surface layer part.
- the plating layer of the present embodiment may have a thickness of 5 to 50 ⁇ m.
- the plating layer of the present embodiment may have a contact pressure cooling pattern on the surface.
- the contact pressure cooling pattern may be in the form of a woven cloth, a net form, or an irregularly entangled line.
- the pattern of the surface of the plating layer of the present embodiment may be formed by transferring the surface pattern of the cooling belt that is pressed tightly to the steel plate surface plating layer to apply cold air.
- the plating step of plating the steel sheet may include a cooling step of quenching the steel sheet at a cooling rate of 20 ° C / sec or more.
- the plated steel sheet manufacturing method of the present embodiment includes a plating step of plating the steel plate, an adjusting step of adjusting the plating adhesion amount of the steel plate, and a cooling step of cooling the steel plate, wherein the adjusting step is plated by a knife contacting the plating layer on the surface of the steel plate.
- the step of adjusting the amount of adhesion primarily, and supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the knife may include cooling the knife.
- the plated steel sheet manufacturing method of the present embodiment includes a plating step of plating a steel sheet, an adjusting step of adjusting the plating adhesion amount of the steel sheet, and a cooling step of cooling the steel sheet, wherein the cooling step comprises a steel sheet with a cooling body contacting the plating layer on the surface of the steel sheet Cooling the steel sheet by applying cold air, and supplying a cryogenic liquid including liquid nitrogen or liquid helium to the cooling body, and cooling the cooling body.
- the plated steel sheet manufacturing method of the present embodiment includes a plating step of plating the steel plate, an adjusting step of adjusting the plating adhesion amount of the steel plate, and a cooling step of cooling the steel plate, wherein the adjusting step is plated by a knife contacting the plating layer on the surface of the steel plate. Adjusting the deposition amount first, and supplying the cryogenic liquid containing liquid nitrogen or liquid helium to the knife to cool the knife, wherein the cooling step is performed on the steel sheet by a cooling body in contact with the plating layer on the surface of the steel sheet. Cooling the steel sheet by applying cold air, and supplying a cryogenic liquid including liquid nitrogen or liquid helium to the cooling body to cool the cooling body.
- the adjusting step includes the steps of: cooling the steel sheet while secondly adjusting the plating adhesion amount with the chill roll which is in close contact with the plating layer on the surface of the steel sheet, and supplying the cryogenic liquid containing liquid nitrogen or liquid helium to the chill roll to cool the chill roll. It may further include.
- the adjusting step may further include detecting a contact load of the knife or chill roll on the steel sheet, and controlling the pressing force of the knife or chill roll on the steel sheet according to the detected contact load.
- the cooling step may further include detecting a contact load of the cooling body against the steel sheet, and controlling a pressing force of the cooling body against the steel sheet according to the detected contact load.
- the adjusting step and the cooling step may be a structure that gradually reduces the thickness of the plated layer of the steel sheet along the moving direction of the steel sheet.
- the tip portion of the knife can be maintained at a temperature of -250 to 5 °C.
- the chillol may be maintained at a temperature of -250 to 5 °C.
- the cooling body may be maintained at a temperature of -250 to 5 °C.
- the plated steel sheet may be manufactured by quenching to a temperature of 250 ° C. or less at a cooling rate of 20 ° C./sec or more.
- the method may further include using the discharge gas by the liquid nitrogen used in the adjusting or cooling step as a reducing gas in the blast furnace or as a gas for maintaining the atmosphere of the cooling process.
- the method may further include transferring the pattern formed on the surface of the cooling body to the plating layer to form a pattern on the surface of the plating layer.
- the plated steel sheet according to the present embodiment as described above has almost no surface defects, and has a single-phase structure of 5 ⁇ m or less and a uniform plating structure.
- the plated steel sheet of the present embodiment is more precisely controlled plating deposition amount is very small plating variation and plating layer structure deviation.
- the plated steel sheet of the present embodiment is less surface defects and can be obtained very excellent quality in corrosion resistance and crack resistance.
- FIG. 1 is a schematic diagram showing a hot dip galvanizing apparatus according to the present embodiment.
- FIG. 2 is a schematic view showing a knife structure of the hot dip galvanizing apparatus according to the present embodiment.
- FIG 3 is a schematic view showing another embodiment of a knife of the hot dip galvanizing apparatus according to the present embodiment.
- FIG. 4 is a schematic view showing a contact load control structure for the steel sheet of the knife according to the present embodiment.
- FIG. 5 is a schematic view showing various embodiments of the tip structure of the knife and the arrangement structure with respect to the steel sheet according to the present embodiment.
- FIG. 6 is a schematic diagram showing the structure of a chill roll of a hot dip galvanizing apparatus according to the present embodiment.
- FIG. 7 to 8 are schematic views showing the structure of the cooling unit of the oil galvanizing apparatus according to the present embodiment.
- 9 and 10 are electron micrographs showing the surface plating layer structure of the plated steel sheet prepared according to the present embodiment in comparison with the prior art.
- 11 is an electron micrograph showing a cross-sectional structure of the plating layer when the cooling rate is increased for the Comparative Example.
- FIG. 12 is a diagram showing the plated layer characteristics of the plated steel sheet prepared according to the present embodiment in comparison with the conventional.
- FIG. 13 is a view illustrating a change in plating layer crystal structure of the comparative examples and the examples of FIG. 12 according to the present embodiment using an X-ray diffractometer.
- FIG. 14 and 15 are electron micrographs showing the cross-sectional structure of the plating layer for the comparative examples and embodiments of FIG. 11 according to the present embodiment.
- 16 is a view showing the results of the corrosion resistance test results for the coated steel sheet according to the present embodiment.
- FIG 17 illustrates a plated steel sheet having a pattern formed on the surface of the plating layer according to the present embodiment.
- This embodiment describes as an example a hot dip galvanizing apparatus for plating a zinc-based metal or a metal alloy onto a steel sheet surface with a plating apparatus.
- the present plating apparatus is not limited to the plating of zinc-based metals or metal alloys, and is applicable to both hot dip plating apparatuses for various metals.
- FIG. 1 schematically shows a hot dip galvanizing apparatus according to the present embodiment.
- the plating apparatus of the present embodiment is a plating bath 10 for hot-dip steel plate (P), the steel plate is disposed on one side or both sides of the steel plate at the rear end of the plating bath 10 along the steel plate traveling direction Wiping part for controlling the plating deposition of the, and the cooling unit for cooling the steel sheet is disposed on one side or both sides of the steel plate at the rear end of the wiping portion along the steel plate traveling direction.
- P hot-dip steel plate
- the steel sheet P guided to the plating bath 10 is immersed in the molten metal while passing through a sink roll 12 disposed in the plating bath 10 to perform a hot dip plating process.
- the steel sheet P is moved in the direction of movement by the sink roll 12 to move above the plating bath 10.
- the steel plate P whose surface is plated by the molten metal in the plating bath 10 is drawn out to the upper portion of the plating bath 10.
- the steel sheet is made of a plated steel sheet via a wiping portion and a cooling portion that are sequentially disposed along a traveling direction.
- the steel sheet quenched through the cooling section proceeds to the process via the tension roll (14).
- the wiping part is in direct contact with the plating layer attached to the surface of the steel sheet to have a structure for adjusting the plating adhesion amount.
- the wiping unit 20 contacts the plating layer on the surface of the steel sheet P to control the coating amount, and supplies the cryogenic liquid including liquid nitrogen or liquid helium to the knife 20 to supply the knife 20. It may include a refrigerant supply unit 50 for cooling).
- the coolant supply unit 50 cools the knife 20 to a cryogenic liquid, thereby lowering the temperature of the knife 20 so that the plating solution is fused to the knife 20 even when the knife 20 is in direct contact with the hot plating layer. Can be prevented.
- the cooling unit is configured to cool the steel sheet by directly contacting the plating layer on the surface of the steel sheet.
- the cooling unit is in contact with the plating layer on the surface of the steel sheet at least one cooling body 60 for cooling the plating layer, and supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the cooling body (60) 60 may include a refrigerant supply unit 50 for cooling.
- the cooling unit cools the cooling body 60 to a cryogenic liquid, thereby lowering the temperature of the cooling body 60 so that the plating solution is fused to the cooling body 60 even when the cooling body 60 is in direct contact with the hot plating layer. Can be prevented.
- the refrigerant supply unit 50 is for supplying cryogenic liquid to the knife 20 or the cooling body 60, for example, a tank containing cryogenic liquid, a supply line for transporting cryogenic liquid, a supply installed on a supply line It may include a pump.
- the refrigerant supply unit 50 is applicable to all of the structural surface to supply the cryogenic liquid can be variously modified.
- cryogenic liquid used in the refrigerant supply unit 50 various liquids such as liquid argon may be used in addition to liquid nitrogen and liquid helium.
- liquid nitrogen can be more economical.
- the knife 20 and the cooling body 60 cooled by using the cryogenic liquid directly contact the steel sheet P to control and rapidly cool the plating amount of the steel sheet, thereby precisely adjusting the plating adhesion amount of the plated steel sheet through this embodiment. It can control and can raise the cooling rate of a plated steel plate to 20 degree-C / sec or more. Therefore, it is possible to significantly shorten the equipment line length for cooling the steel sheet and increase the product production speed.
- the cryogenic liquid supplied to the knife 20 or the cooling body 60 through the coolant supply unit 50 may be gasified by heat exchange with the plating layer while passing through the knife 20 or the cooling body 60.
- the gas discharged from the knife 20 or the cooling body 60 may be recycled by using a reducing gas in a heat treatment furnace of a steelmaking process or a gas for maintaining a non-oxidizing atmosphere in a cooling process through an appropriate filtration device. .
- FIG. 2 illustrates a specific structure of the knife according to the present embodiment.
- the knife 20 is disposed opposite to both sides of the steel sheet to adjust the deposition amount of the plating liquid on both sides of the steel sheet (P).
- Knife 20 disposed on both sides of the steel sheet (P) is made of the same structure, the following description will be described by way of example only the knife 20 for one surface of the steel sheet.
- the knife 20 extends in the width direction of the steel plate P and has a body 22 in which a cryogenic liquid is gentle, and is installed at the tip of the body 22 and in contact with a plating layer of the steel plate.
- a cryogenic liquid is gentle
- the body 22 and the tip part 24 may be made of a metal, ceramic, or ceramic coated metal material having excellent cryogenic durability so that it can be stably used for a long time in a cryogenic environment due to the use of liquid nitrogen. have.
- the body 22 has a flow path 26 formed therein so that cryogenic liquid passes therethrough.
- the refrigerant supply unit 50 connected to the body 22 circulates and supplies the cryogenic liquid through the flow path 26.
- the flow path 26 extends to the tip where the tip 24 is positioned to sufficiently cool the tip 24 installed at the tip of the body 22, so that the cryogenic liquid can contact the tip 24.
- the tip part 24 may be detachably installed with respect to the body 22.
- the tip portion 24 keeps in contact with the hot plating layer and wears out. Accordingly, the tip portion 24 that is consumable can be replaced to replace the tip portion 24 in the body 22 when worn, so that the knife 20 can be continuously used.
- the tip portion 24 may have a structure that is pointed toward the tip for more precise plating deposition control.
- the cryogenic liquid supplied to the body 22 is circulated along the flow path 26 to cool the tip 24, thereby keeping the tip 24 at a low temperature. Accordingly, the tip part 24 may first control the plating adhesion layer more accurately while preventing the plating solution from being attached to the tip part 24 in the state in contact with the plating layer.
- Knife according to the embodiment of Figure 3 has a structure having a plurality of tips to be used immediately to replace the tip portion.
- the knife 21 of the present embodiment extends in the width direction of the steel sheet and is rotatably installed therein and a space along the circumferential direction on the outer circumferential surface of the rotating body 23 and the outer surface of the rotating body 23 circulating cryogenic liquid.
- the tip part 24 which is installed in contact with the plated layer on the surface of the steel sheet P and controls the plating amount, and is connected to the rotating body 23 to rotate the rotating body 23 so that the one side tip part 24 faces the steel plate surface. It may include a rotation driving unit to be disposed.
- the tip part 24 is immediately moved by rotating the rotating body 23 to separate the tip part 24 in use from the steel plate and moving the other tip part 24 in the air toward the steel plate. It can be replaced.
- four tip parts 24 may be disposed at an angle of 90 degrees along the outer circumferential surface of the rotating body 23. As a result, the rotating body 23 is rotated at an angle of 90 degrees to move each tip portion 24 toward the steel plate surface.
- the number of installation of the tip portion 24 can be variously modified.
- the rotating body 23 may have a cylindrical shape.
- the rotating body 23 is not limited to a cylindrical shape, for example, may have a structure in which the above-mentioned body 22 is continuously disposed at an angle along the outer circumferential surface of the rotating shaft. Both ends of the rotating body 23 may be rotatably supported by a separate support (not shown) on the installation.
- the rotating body 23 may also be made of metal, ceramic, or ceramic coated metal having excellent cryogenic durability so that it can be stably used for a long time in a cryogenic environment due to the use of liquid nitrogen.
- the rotating body 23 is formed with a flow path (not shown) so that the cryogenic liquid passes therein.
- the flow path formed inside the rotating body 23 may be connected to the refrigerant supply unit 50 through both ends of the rotating shaft of the rotating body 23.
- the cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path inside the rotor 23 through the tip of the rotor 23.
- the flow path is formed to extend to the surface on which the tip portion 24 is located to sufficiently cool the tip portion 24 installed on the outer circumferential surface of the rotating body 23 to allow the cryogenic liquid to contact the tip portion 24.
- a tip portion 24 is installed along the axial direction on the surface of the rotating body 23.
- the tip part 24 may be detachably installed on the surface of the rotating body 23.
- the rotation driving unit is applicable to all of the structural surface to rotate the rotating body 23 by a predetermined angle.
- the rotating shaft may include a step motor 27 connected to the rotating body 23 and the driving belt 25 to transmit power.
- the step motor 27 is rotated by a predetermined amount, power is transmitted to the rotating body 23 through the driving belt 25 so that the rotating body 23 is rotated by the disposition interval of the tip portion 24.
- the new tip portion 24 provided on the rotor 23 surface in the air moves toward the steel sheet and contacts the plating layer on the steel sheet surface.
- the tip portion 24 that is worn or abnormal according to the rotation of the rotor 23 is spaced outward from the steel plate surface is moved to the standby position.
- the worn tip 24 is processed through a replacement or surface polishing operation in the standby position.
- the time required for replacing the tip portion 24 can be reduced and the work can be continuously performed.
- the knives 20 and 21 may circulate the cryogenic liquid therein to cool the tip portion 24 to -250 to 5 ° C.
- the temperature of the tip part 24 is higher than 5 ° C., a problem arises in that the hot plating solution is attached to the tip part 24.
- the temperature of the tip portion 24 is lower than ⁇ 250 ° C., low temperature brittle fracture of the tip portion 24 occurs.
- the knife 20, 21 is moved relative to the steel plate to precisely control the amount of plating adhesion by the tip portion (24).
- the wiping part is provided in the knife 20 to detect a contact load of the tip part 24 against the steel plate P.
- the load sensor 30 and the control unit 32 for controlling the pressing force of the tip portion 24 with respect to the steel sheet by moving the knife 20 with respect to the steel sheet in accordance with the detection signal of the load sensor 30 have.
- the gap between the tip portion 24 and the steel sheet P is changed to control the plating adhesion amount of the steel sheet.
- the interval between the tip portion 24 and the steel sheet P can be confirmed through the contact load of the tip portion detected through the load sensor 30.
- the tip portion 24 deeply enters the plating layer of the steel sheet, and the contact load increases as the amount of contact with the plating solution increases, whereas the tip portion 24 becomes the steel sheet P.
- spaced apart from decreases the contact load with the plating solution.
- the controller 32 controls the plating amount by calculating the detection value of the load sensor 30 by moving the knife 20 with respect to the steel plate P according to the plating amount set primarily.
- Movement of the knife 20 relative to the steel sheet may be made through, for example, a driving unit 34 such as a driving cylinder coupled to the knife 20.
- the drive unit 34 may be used a variety of power sources such as a drive cylinder or a motor, it is possible to apply both of the structural surface to move the knife 20 in a straight line with respect to the steel sheet.
- control unit 32 may detect the change in the measured value of the load sensor 30, and determine whether there is a device abnormality. When determining the abnormality of the device, it is possible to immediately take the necessary measures, such as replacing the tip portion 24 in the knife 20.
- FIG 5 illustrates the shape of the tip portion of the knife with respect to the steel plate and the arrangement of the tip portion with respect to the steel plate.
- the tip portion 24 installed in the knife 20, 21 may be formed in a variety of structures, such as a straight form, or a bent in the middle to form a V-shape.
- the body 22 or the rotating body 23 of the knife in which the tip part 24 is installed may also have the same structure as that of the tip part 24.
- the body 22 of the knife 20 on which the tip portion 24 is installed may also have a V shape having the same shape as the tip portion 24. .
- the tip portion 24 may be disposed parallel to the steel plate P with respect to the width direction.
- the tip portion 24 may be disposed to be inclined with respect to the width direction of the steel sheet.
- the bent portion may be disposed in an inverted V shape or in a V shape so that the bent portion faces the moving direction of the steel plate or faces the moving direction of the steel plate. Can be.
- the contact load between the plated layer and the tip portion 24 can be reduced to more smoothly control the deposition amount of the plated layer.
- the wiping portion is disposed in the rear end of the knife 20 along the steel plate traveling direction to more precisely control the plating deposition amount of the steel sheet and to quench the plating layer of the steel sheet 40 It may further include.
- the chill roll 40 is a roll structure that is disposed in the width direction of the steel sheet and is in close contact with the plating layer. Both ends of the chill roll 40 may be rotatably supported by a separate support (not shown) on the installation.
- the chill roll 40 may be freely rotatable and may be rotated according to the movement of the steel sheet or may be rotated at a set speed by being connected to a separate driving source.
- the chill roll 40 may have an average surface roughness of 0.1 to 3 ⁇ m.
- the chill roll 40 has a structure in which the cryogenic liquid is circulated inside and cooled to a low temperature.
- the chill roll 40 may be made of a metal, ceramic (ceramic) or a ceramic coated metal material having excellent cryogenic durability so that it can be used for a long time in a cryogenic environment according to the use of liquid nitrogen.
- a flow path is formed in the chill roll 40 to allow cryogenic liquid to pass.
- the flow path formed in the chill roll 40 may be connected to the refrigerant supply unit (see 50 of FIG. 1) through both ends of the rotation shaft of the chill roll 40.
- the cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path inside the chill roll 40 through the tip of the chill roll 40.
- the surface of the chill roll 40 is maintained at a low temperature by the cryogenic liquid supplied into the chill roll 40.
- the chill roll 40 prevents the plating solution from adhering to the surface of the chill roll 40 in a state of being in contact with the plating layer of the steel sheet P, and rapidly cools the plating layer.
- the chill roll 40 is in close contact with the plating layer on the surface of the steel sheet (P) and secondly precisely controls the plating amount of the steel sheet (P) through the knife 20.
- the chill roll 40 may be in contact with the plating layer to rapidly cool the plating layer through direct heat exchange.
- the chill roll 40 may circulate the cryogenic liquid therein to cool the temperature to -250 to 5 ° C.
- the temperature of the chill roll 40 is higher than 5 ° C.
- the cooling performance and the surface quality improvement efficiency of the plated steel sheet are deteriorated.
- the chill roll 40 has a temperature lower than ⁇ 250 ° C., low temperature brittle fracture of the chill roll 40 occurs.
- the plating apparatus of the present embodiment can more precisely control the plating deposition amount through the low-temperature knife 20 and the chill roll 40 in contact with the steel plate plating layer.
- the chill roll 40 cooled at a low temperature pressurizes the plating layer and rapidly cools the microstructure of the plating layer, thereby effectively reducing the variation in the deposition amount in the width direction.
- the plating apparatus can quench the steel sheet at a cooling rate of 20 ° C / sec.
- the chill roll 40 is cooled while pressing the plating layer under a predetermined pressure, it is possible to improve the plating performance of the non-plating steel type.
- the sink roll 12 and the chill roll 40 of the plating bath 10 are interlocked to support the steel sheet P so that the steel sheet passes through the contact knife 20 in the width direction. Bending does not occur at all. That is, the steel sheet passes through the sink roll 12 and the chill roll 40 at the front end and the rear end of the knife 20 in the steel plate moving direction, respectively. Thus, the steel sheet P passes through the knife 20 without the occurrence of the bending phenomenon in the flattened state by the sink roll 12 and the chill roll 40.
- the plating adhesion amount deviation in the width direction occurs, and plating surface defects such as comb defects due to side over plating occur.
- plating surface defects frequently occur due to the bending of the steel sheet, but in the present embodiment, by preventing bending of the steel sheet, it is possible to manufacture a coated steel sheet having almost no plating deposition amount and plating layer structure deviation in the width direction. .
- the wiping part of the present embodiment is provided on the chill roll 40 like a knife for precise control of the plating adhesion amount by the chill roll 40 and detects a contact load of the chill roll 40 against the steel sheet.
- a control unit 32 for controlling the pressing force of the chill roll 40 against the steel sheet by moving the chill roll 40 with respect to the steel sheet by operating the driving unit 34 according to the detection signal of the load sensor.
- the gap between the chill roll 40 and the steel sheet is changed to precisely control the plating adhesion amount of the steel sheet.
- the structure of the load sensor and the control unit for the chill roll 40 is the same as that of the load sensor 30 and the control unit 32 and the drive unit 34 for the knife 20 mentioned above, and the same reference numerals are used, and the structure thereof. And the action refers to the description of the load sensor 30 and the control unit 32 for the knife 20, the detailed description thereof will be omitted.
- the control unit 32 may calculate the detection value of the load sensor 30 to move the chill roll 40 with respect to the steel sheet to press the plating layer, thereby more precisely controlling the amount of plating.
- the plating layer is pressed by the chill roll and quenched at a cooling rate of 20 ° C./sec or more, it is possible to obtain a plating layer having a finer structure while minimizing the variation in the width direction plating amount.
- the wiping unit is configured to remove contaminants on the surface of the chill roll 40 in case the surface of the chill roll 40 is contaminated.
- the wiping unit may further include a scraper 44 in contact with the chill roll 40 to remove contaminants attached to the surface of the chill roll 40.
- the scraper 44 may be installed to extend in the axial direction of the chill roll 40 to contact the surface of the chill roll 40. As a result, as the chill roll 40 is rotated, contaminants attached to the chill roll 40 surface are caught by the scraper 44 and removed from the chill roll 40 surface.
- the plated coating amount is precisely adjusted through the wiping part and the steel plate having quenching is rapidly cooled to a temperature below a predetermined temperature while passing through a cooling part disposed at the rear end of the wiping part.
- the steel plate is precisely controlled while the plated layer thickness is passed through the cooling unit.
- FIG 7 and 8 illustrate the structure of the cooling unit according to the present embodiment.
- the cooling unit adheres to the plating layer on the surface of the steel sheet to supply at least one cooling body 60 to cool the plating layer, and to supply the cryogenic liquid including liquid nitrogen or liquid helium to the cooling body 60 to supply the cooling body 60. It may include a refrigerant supply unit 50 for cooling.
- the cooling body 60 may include a cooling roll 62 extending in the width direction of the steel sheet and having a cryogenic liquid circulated therein and pressurized to the plating layer on the surface of the steel sheet P to apply cold air.
- the cooling rolls 62 may have a structure in which a plurality of cooling rolls 62 are arranged in multiple stages at intervals along a traveling direction of the steel sheet.
- the cooling roll 62 is a roll structure that is disposed in the width direction of the steel sheet similarly to the chill roll 40. Both ends of the cooling roll 62 may be rotatably supported by a separate support (not shown) on the installation.
- the cooling roll 62 may be freely rotatable and may be rotated according to the movement of the steel sheet or may be rotated at a set speed by being connected to a separate driving source.
- the cooling roll 62 has a structure in which the cryogenic liquid is circulated and cooled to low temperature.
- the cooling roll 62 has a flow path 64 formed therein to allow the cryogenic liquid to pass therethrough.
- the flow path 64 formed in the cooling roll 62 may be connected to the refrigerant supply unit (see 50 of FIG. 1) through both ends of the rotation shaft of the cooling roll 62.
- the cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path 64 inside the cooling roll 62 through the tip of the cooling roll 62.
- the surface of the cooling roll 62 is maintained at a low temperature by the cryogenic liquid supplied into the cooling roll 62.
- the cooling body 60 may further include a cooling belt 66 that is wound and installed between at least two cooling rolls 62 and presses and adheres to the plating layer on the surface of the steel sheet P to apply cold air.
- the cooling belt 66 not the cooling roll 62, is in direct contact with the plated layer of the steel sheet.
- the cooling roll 62 and the cooling belt 66 are metal, ceramic, or ceramic coated metal such as stainless steel having excellent cryogenic durability, so that the cooling roll 62 and the cooling belt 66 can be stably used in a cryogenic environment due to the use of liquid nitrogen. Or the like.
- the cooling roll 62 or the cooling belt 66 in contact with the surface of the steel sheet may have an average surface roughness of 0.1 to 3 ⁇ m.
- the surface roughness of the cooling roll 62 or the cooling belt 66 is higher than 3 ⁇ m, a non-uniform after-treatment problem occurs due to poor surface quality, and when the surface roughness is lower than 0.1 ⁇ m, such as after chemical treatment, The problem that processing characteristics are deteriorated arises.
- the cooling belts 66 are wound around the two cooling rolls 62 to form one cooling body 60, and one or more of these cooling bodies 60 are disposed at intervals along the advancing direction of the steel sheet. Structure. Installation intervals and the number of the respective cooling bodies 60 can be variously modified depending on the facilities and process conditions.
- Each of the cooling bodies 60 may have the same structure, and the structure of one cooling body will be described below as an example.
- the cooling belt 66 is wound around the two cooling rolls 62 spaced apart from each other, and the cooling belt 66 is in surface contact with the plating layer on the surface of the steel sheet.
- the cooling belt 66 may be rotated according to the moving speed of the steel sheet by, for example, the rotational drive of the cooling roll 62 in contact with the steel sheet. By rotating the cooling belt 66 in accordance with the moving speed of the steel sheet, it is possible to minimize the friction between the steel sheet and the cooling belt 66 and to prevent the plating layer damage due to the friction.
- the cooling roll 62 cools the provided cooling belt 66 to a low temperature.
- the cooling belt 66 is in surface contact with the plating layer in a state of being cooled to a low temperature by the cooling roll 62, so that the plating layer can be rapidly cooled. That is, the cooling belt 66 is in surface contact with the plated layer on the surface of the steel sheet between the two cooling rolls (62).
- the cooling unit of the present embodiment can increase the cooling area for the steel plate plated layer through the cooling belt 66 to increase the cooling rate.
- the cooling roll 62 may circulate the cryogenic liquid therein to cool the temperature of the cooling belt 66 in contact with the plating layer to -250 to 5 ° C.
- the temperature of the cooling belt 66 is higher than 5 °C causes a problem that the cooling performance and surface quality improvement efficiency of the plated steel sheet is lowered.
- the temperature of the cooling belt 66 is lower than -250 °C problem of low temperature brittle fracture of the cooling belt 66 occurs.
- the cooling belt 66 provided on the cooling roll 62 contacts the plating layer to solidify the plating solution within a faster time, so that the plating apparatus of the present embodiment uses the steel sheet at a cooling rate of 20 ° C./sec through the cooling section at 250 ° C./sec. It can be quenched to a temperature below ⁇ ⁇ .
- the cooling unit may tension the cooling belt 66 by adjusting a gap between two cooling rolls 62 constituting the unit. As the cooling belt 66 is tensioned and unfolded, the plating layer on the surface of the steel sheet and the cooling belt 66 may be smoothly contacted, and the plating layer may be cooled more evenly.
- a driving cylinder 68 may be installed between the cooling rolls 62 between the two cooling rolls 62 in which the cooling belt 66 is wound.
- the driving cylinder 68 is driven in accordance with the signal of the control unit 32 to be separated between the cooling roll 62. As the gap between the cooling rolls 62 opens, the cooling belt 66 is stretched taut.
- the cooling roll 62 can precisely adjust the pressing force on the plated layer of the steel sheet.
- the cooling roll 62 is not shown, but may be provided with a load sensor, a control unit and a driving unit in the same manner as the chill roll 40.
- the pressing force adjusting structure of the cooling roll is the same as the structure of the load sensor 30 and the control unit 32 and the driving unit 34 for the chill roll 40 mentioned above, and a detailed description thereof will be omitted.
- the cooling roll is pressed close to the pressure set on the steel sheet to precisely control the thickness of the plated layer of the steel sheet.
- the cooling unit calculates the detection value of the load sensor to move the cooling roll 62 with respect to the steel sheet to precisely adjust the plated layer pressing force by the cooling belt 66, thereby precisely controlling the thickness of the plated layer. .
- the pressing force of the cooling belt 66 according to the movement of the cooling roll 62 may be the same or different for each of the plurality of cooling bodies 60 arranged along the moving direction of the steel sheet. That is, each of the cooling bodies 60 arranged along the moving direction of the steel sheet may be in close contact with the steel sheet with the same pressing force. Alternatively, the cooling bodies 60 may be in close contact with the steel sheet by gradually increasing the pressing force along the moving direction of the steel sheet. Therefore, the steel sheet receives a gradually high pressing force while passing through each of the cooling bodies 60, thereby gradually reducing the thickness of the plating layer.
- the plated layer of the steel sheet may be gradually pressed while moving from the knife 20 to the cooling roll 62 along the moving direction of the steel sheet to more precisely control the plating layer thickness.
- the cooling unit can improve the plating performance even for non-plated steel grades.
- the plating apparatus of the present embodiment can rapidly cool the plating layer in comparison with the prior art by closely cooling the cooling belt cooled by the cryogenic liquid to the plating layer.
- Plated steel sheet cooling has a direct impact on the surface quality of the product. If the uncondensed plating layer comes in contact with contaminated gas or rolls in the rear of the installation, the plating layer must be completely solidified before entering the rear of the installation, as this causes direct surface defects.
- the heat capacity is low, the cooling capacity is lowered, and in order to cool the plated steel sheet below a certain temperature to completely solidify the plated layer required a very long multi-stage cooling line.
- the cooling line is considerably complicated and the size of the facility is so large that it is difficult to effectively manage the facility, so that surface defects are frequently generated.
- the difference between the solidification start temperature and the solidification completion temperature of the plating layer is large, such as an alloy plated steel sheet in which a large amount of Al and Mg are added to the Zn plating solution, it is difficult to obtain a sufficient cooling effect using a conventional gas method.
- the cooling of the plating layer is not performed properly, and a coarse and fragile plating layer structure containing Al, Mg, which is a strong oxidizing metal, is generated, and plating surface defects such as black spots and black stools are generated in these areas, and problems of plating layer cracking and deterioration of corrosion resistance are generated. Will cause.
- the cooling belt 66 directly contacts the plating layer of the steel sheet and cools the plating layer using cryogenic liquid, thereby further increasing the cooling efficiency.
- the time required for cooling the plating layer can be greatly shortened. Therefore, according to the present embodiment, the cooling rate of the plated steel sheet is increased to 20 ° C./sec or more, thereby further reducing the facility line of the cooling unit.
- the gas does not directly contact the steel sheet, it is possible to minimize the occurrence of surface defects, and to obtain a smaller and more uniform plating structure, it is possible to manufacture high quality coated steel sheet.
- the cooling belt may have a structure formed by stamping a pattern on the plating layer in the process of pressing and cooling the plating layer of the plated steel sheet.
- the pattern may mean a repetitive pattern or pattern.
- the surface of the plated layer may be processed through a structure in which various patterns are formed on the cooling belt and transferred.
- the cooling belt may be a pattern to be transferred to the plating layer on the surface.
- the steel plate coated with molten zinc through the plating bath is moved to the upper portion of the plating bath to manufacture a plated steel sheet through a process of adjusting the plating adhesion amount of the steel plate and a process of cooling the steel plate.
- the steel sheet coming out of the plating bath is primarily controlled by the low temperature knife contacting the plating layer on the surface of the steel sheet. Then, the plating deposition amount is secondarily controlled by the low temperature chill roll in contact with the steel plate surface plating layer at the rear end of the knife.
- the coating amount adjustment by the knife and the chill roll can be precisely controlled by detecting the contact load between the knife and the chill roll with respect to the steel sheet, and controlling the pressing force by moving the knife and the chill roll with respect to the steel sheet in accordance with the detected contact load.
- the knife and chill roll are cooled to a low temperature by supplying a cryogenic liquid such as liquid nitrogen.
- the tip portion provided to the knife is cooled to a temperature of 5 ° C or lower by the cryogenic liquid supplied to the knife.
- the plating solution is not fused to the tip portion cooled to a low temperature in a state in which the tip portion contacts the plating layer to adjust the plating deposition amount. Therefore, the knife can accurately control the plating adhesion amount of the plating layer in a state where the tip portion is in physical contact with the plating layer. In this way, the plated amount of the plated layer of the steel sheet from the plating bath is controlled by the knife.
- the chill roll primarily contacts the plating layer of the steel sheet whose deposition amount is controlled by the knife and physically pressurizes the plating layer, thereby controlling the plating deposition amount more precisely.
- the chill roll is also cooled to low temperature by the cryogenic liquid supplied therein, so that the surface of the chill roll in contact with the plating layer is cooled to 5 ° C or lower.
- the plating solution does not adhere to the chill roll surface in the state where the chill roll is pressed against the plating layer and pressed. Therefore, by pressing the chill roll to the plating layer, it is possible to precisely control the plating deposition amount of the plating layer.
- the plated layer of the steel sheet is rapidly cooled by a chilled chill roll while the steel sheet is pressed by the chill roll to control the coating amount.
- the chill roll is rapidly cooled as the plating layer in contact with the chill roll heats up with the chill roll while being cooled by the cryogenic liquid as mentioned. In this way, the chill roll is in contact with the plating layer to cool the plating layer, the plated steel sheet can be quenched at a cooling rate of 20 ° C / sec or more.
- the steel sheet rapidly cooled while passing through the chill roll is quenched below a set temperature while passing through a cooling section disposed at the rear end of the chill roll.
- a plurality of units including a cooling roll and a cooling belt are continuously arranged as the cooling body, and the cooling belt of each unit is pressed against the plated layer on the surface of the steel sheet.
- the chill roll like the chill roll, is supplied with a cryogenic liquid such as liquid nitrogen to the inside, and cooled to a low temperature. Cold air of the cooling roll is applied to the plating layer through the cooling belt to quench the plating layer.
- a cryogenic liquid such as liquid nitrogen
- the cooling belt is cooled to low temperature by the cryogenic liquid so that the plating layer is not attached to the cooling belt while the cooling belt is pressed against the plating layer.
- the cooling belt cools the plating layer in a state in which the plating layer of the steel sheet is pressed at an appropriate pressure. Adjusting the pressing force of the cooling belt with respect to the steel sheet can detect the contact load of the cooling belt with respect to the steel sheet, and move the cooling belt with respect to the steel sheet according to the detected contact load to precisely control the pressing force.
- the plated steel sheet subjected to the chill roll may be cooled by a cooling belt while passing through a cooling section, and may be quenched to a temperature of 250 ° C. or less at a cooling rate of 20 ° C./sec or more.
- a pattern may be formed on the surface of the plated layer of the plated steel sheet.
- the pattern formed on the surface of the cooling belt presses the plated layer.
- the pattern formed on the surface of the cooling belt is transferred to the plating layer as it is, the same pattern as the pattern formed on the surface of the cooling belt is formed on the surface of the plating layer.
- a pattern having a desired shape may be formed on the surface of the plated steel sheet.
- the thickness of the steel sheet is gradually reduced along the moving direction of the steel sheet, so that the thickness of the steel sheet can be more precisely controlled. do.
- Liquid nitrogen may be gasified in the process of adjusting the coating weight and cooling the plating layer, and the exhaust gas generated in this process may be reduced gas in the furnace or gas for maintaining the atmosphere of the plating steel plate cooling process after filtration. Can be recycled.
- the plated steel sheet of the present embodiment prepared by rapid cooling as described above forms a smaller and more uniform plated structure, and excellent quality can be obtained in corrosion resistance and crack resistance.
- the plated steel sheet of the present embodiment may form a plating layer including Zn on the steel sheet, and the Zn single phase average particle size in the plating layer may be 5 ⁇ m or less.
- the Zn single phase average particle size in the plating layer may be greater than 0 and 10 ⁇ m or less, and more preferably greater than 0 and 5 ⁇ m or less.
- the fraction of the Zn single phase in the plating layer may be 15 to 40 area%.
- the fraction of the Zn single phase is less than 15 area%, the binary process structure is more likely to coarsen and the quality may be degraded. If the Zn single phase fraction is more than 40 area%, the effect of improving the plating properties of the steel sheet is no longer exhibited.
- the Zn single phase may be formed in a uniform distribution in the plating layer.
- the sequin size of the plated layer may be 500 ⁇ m or less.
- the sequin size of the plating layer may be greater than 0 and less than 300 ⁇ m.
- the size of the sequins is larger than 500 ⁇ m, grains coarsen and cracks appear in the plating layer.
- a plated layer including Zn and Mg may be formed on the steel sheet, and the MgZn 2 phase 112/201 ratio in the plated layer may be 0.6 or more.
- the ratio of MgZn 2 phase 112/201 in the plating layer is less than 0.6, the fragility of the weak 201 phase is high, so that there is a high possibility of cracking inside the plating layer, and there is a problem of adversely affecting the corrosion resistance after processing.
- the plated steel sheet may be a plated steel sheet on which a Zn-Al-Mg plating layer is formed.
- the plated steel sheet of the present embodiment may be plated through a plating bath of 0.1 to 7% by weight of Mg, 1 to 9% by weight of Al, and the balance of Zn.
- the plated steel sheet may be plated with a plating adhesion amount of 30 to 400 g / m 2 through the plating bath.
- the plated steel sheet may use a hot rolled steel sheet or a cold rolled steel sheet as a base steel sheet.
- the plating layer thickness of the present embodiment may be 5 to 50 ⁇ m.
- the distribution of the Zn single phase in the plating layer may be uniform along the thickness direction of the plating layer.
- the distribution ratio of Zn single phase on the surface of the plating layer is increased.
- the Zn single phase is uniformly distributed from the interface with the steel plate to the outer surface along the thickness direction of the plated layer by rapid cooling of the plated layer.
- B / A which is a Zn single-phase distribution in the plating layer thickness direction, may be formed at a value of 0.5 to 1.0.
- A is the fraction of the total Zn single phase with respect to the plating layer thickness direction
- B is the fraction of Zn single phase in the plating layer outer surface layer part.
- the surface layer portion may mean an area within approximately 1/2 of the entire thickness of the plating layer on the plating layer outer surface along the plating layer thickness direction.
- B / A is less than 0.5, it means that there is too little Zn single phase distribution in the surface layer part as a whole, resulting in a non-uniform distribution as a whole. Too many distributions also mean that they are uneven throughout. As such, when the B / A value is out of the above range to form a non-uniform distribution, a problem of deterioration of crack resistance of the plating layer occurs.
- the plated steel sheet of this embodiment has a contact type pressurized cooling pattern formed on the surface of the plated layer.
- the pattern may be formed by transferring the surface pattern of the cooling belt is pressed tightly to the plating layer in order to rapidly cool the plating layer of the plated steel sheet to apply cold air.
- a plated steel sheet is formed by forming a plating layer by a conventional cooling method and a cooling method according to the present embodiment. Was prepared to compare tissues.
- a general GI plated steel sheet is a steel sheet in which a plating layer is formed of a plating liquid containing zinc
- PosMAC plating is a steel sheet in which a plating layer is formed of a plating liquid containing magnesium, aluminum, and zinc.
- FIG. 9 shows the plating layer plating structure of the GI plated steel sheet and the PosMAC plated steel sheet prepared by quenching at a cooling rate of 20 ° C./sec or more according to the present invention.
- the plating layer plating structure of the GI plated steel sheet and the PosMAC plated steel sheet produced by slow cooling at a cooling rate of ° C / sec or less is shown.
- the size of the sequins is coarse to 800 to 2,000 ⁇ m in the comparative example, while in the examples, the plating structure is miniaturized so that the grain size is 300 to 500 ⁇ m. You can check it.
- FIG. 10 shows the plated layer cross-sectional structure of the PosMAC plated steel sheet.
- the comparative example shows the plating layer of the steel plate manufactured according to the conventional cooling method
- the Example shows the plating layer of the steel plate manufactured by quenching according to the present invention.
- FIG. 10 in the case of the embodiment, it can be seen that the Zn single phase and the MgZn 2 structure of the plating layer was refined as compared with the comparative example.
- the average particle size and fraction of the Zn single phase can also be seen to be finely and uniformly distributed in the case of Examples compared to the Comparative Example.
- the Zn single phase fraction was confirmed by calculating the surface fraction of the Zn single phase through an image analyzer of the plated layered tissue photograph observed using the optical microscope as shown in FIG. 10.
- the area fraction of Zn single phase was measured by subdividing the area of the whole plating layer and averaging it.
- the Zn single phase average particle size was coarse and the fractional value of Zn single phase was low, and it was confirmed that the deviation was large for each position.
- the average particle size of the Zn single phase in the plating layer is fine to 5 ⁇ m or less, and the fraction of the Zn single phase also shows a high value unlike the comparative example, and it can be confirmed that it is uniformly distributed without deviation.
- Table 1 shows a B / A value which is a Zn single phase distribution in the plating layer thickness direction with respect to the plated steel sheet of this embodiment shown in FIG.
- each photograph is referred to as tissue 1, tissue 2, and tissue 3 from left to right.
- the surface layer part was set to the area
- the value of the B / A has a value of 0.5 or more and 1.0 or less, evenly distributed throughout the thickness direction of the plating layer.
- FIG 11 shows the plated layer cross-sectional structure in the case of cooling by increasing the cooling rate in the comparative example.
- the experiment was performed by applying a cooling method using a conventional gas to the plated steel sheet, and manufactured the fabricated by varying the cooling rate, and then inspecting the cross-sectional structure of the plated layer.
- the Zn single phase is uniform throughout from the interface with the steel plate to the outer surface along the thickness direction of the plating layer as in the present embodiment. Difficult to achieve distribution
- the characteristics of the plated layer were compared with those of the comparative examples prepared by the slow cooling method using a conventional gas and the examples prepared by quenching according to the present invention.
- FIG. 12 is a table illustrating plating layer characteristics of Comparative Examples and Examples under various conditions
- FIG. 13 illustrates an X-ray diffraction tester using the X-ray diffraction tester to change the crystal structure of each of the Comparative Examples and Examples of FIG. 12. It is shown. 14 and 15 show the plated layer cross-sectional structure of the Comparative Examples and Examples, respectively.
- the comparative examples and examples are all 1.5 mm thick plated steel sheets having the same layer of plating, and only the examples were prepared by quenching at a cooling rate of 20 ° C./sec or more according to the present invention. It is prepared by slow cooling at a cooling rate of 10 °C / sec or less according to the cooling method.
- the plating layer defects as shown in Figure 12, means a crack (crack) or a recessed portion
- the plating defect occurrence frequency refers to the number of occurrences of cracks or pits generated in the region within about 10mm of the plating layer length.
- the plating layer structure has a low Zn single phase area but has a coarse particle size of 5 ⁇ m or more, and the occurrence of plating defects increases as the plating amount increases.
- the Zn single-phase fraction is low and the deviation of the microstructures is large.
- the average grain size of the Zn single phase in the plated layer structure is 3 ⁇ m or less, considering that it is an experiment of a batch method, and fine grains may be formed to 5 ⁇ m or less, and MgZn 2 It can be seen that the structure is fine and there are no defects such as cracks and dents in the plating layer. In addition, unlike the comparative example, it can be seen that the fraction of the Zn single phase is high and the uniform plating structure is exhibited without any positional variation.
- the Zn single phase average particle size in the cross-sectional structure of the plating layer is very large, whereas in the embodiment, the Zn single phase average particle size in the cross-sectional structure of the plating layer is very fine and uniformly formed in a size of 5 ⁇ m or less. Therefore, it can be seen that the plated steel sheet according to the present embodiment is a plated steel material having a fine Zn single phase average particle size of 5 ⁇ m or less, uniformly formed in the entire thickness direction of the plated layer, and having excellent crack resistance.
- the plating layer cooling effect is inferior and generates a lot of coarse MgZn 2 201 phase. Accordingly, in the comparative examples, the fraction of the vulnerable 201 phase was high, and the MgZn 2 phase 112/201 ratio was lower than 0.4. Such a plated layer structure has a high risk of cracking inside the plated layer, and adversely affects the corrosion resistance after processing.
- the MgZn2 phase 112 and the 201 ratio of the MgZn2 phase was fine because it was prepared by rapid cooling to have a fine MgZn2 phase.
- the MgZn 2 phase 112/201 ratio is increased from 0.6 to 5 in the present embodiment.
- the distribution of the Zn single phase in the plating layer is uniform throughout the plating layer along the thickness direction.
- Figure 16 shows the results of the corrosion resistance of the comparative examples prepared by the slow cooling method using a conventional gas for the PosMAC plated steel sheet and the embodiments prepared by quenching according to the present invention.
- FIG. 16 shows the elapse of 800 hours after the salt spray test (SST) was carried out for the Comparative Examples and Examples. As shown in Figure 16, it can be confirmed that the corrosion resistance is excellent in the case of the embodiment compared to the comparative example.
- FIG. 17 illustrates a plated steel sheet of various embodiments having a form of contact pressure cooling pattern formed on the surface of the plated layer.
- the pattern may be variously formed in the form of a woven cloth, a polygonal shape such as a net, an irregular closed curve shape, and the like.
- the pattern for the plating layer is not limited thereto and may be variously modified. .
- a pattern was formed in advance on the surface of the cooling belt for rapidly cooling the plated steel sheet in the manufacturing process of the plated steel sheet, and the contact belt was pressed and cooled to form a contact pressure cooling pattern in the plated layer.
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Abstract
Description
도금층 | 조직1(%) | 조직2(%) | 조직3(%) |
두께 방향 전체에 대한 Zn 단상 분율(A) | 32.26 | 23.3 | 20.9 |
표층부에 대한 Zn 단상 분율(B) | 31.9 | 16.58 | 13.63 |
B/A | 0.99 | 0.71 | 0.65 |
Claims (24)
- 강판 상에 용융도금 후 접촉식 가압냉각으로 형성된 Zn계 도금층을 포함하고,상기 Zn계 도금층은 평균 입도 5㎛ 이하인 Zn 단상 조직을 포함하고,상기 도금층 내 Zn 단상 분포도 B/A가 0.5 내지 1.0의 조건을 만족하여, 도금층 두께 방향에 대해 Zn 단상이 균일한 분포로 형성된 미세하고 균일한 도금 조직을 갖는 도금 강판.여기에서 A는 도금층 두께 방향에 대한 전체 Zn 단상의 분율이고, B는 도금층 외측 표층부에서의 Zn 단상 분율이다.
- 제 1 항에 있어서,상기 도금층의 Zn 단상의 분율은 15 내지 40 면적%인 미세하고 균일한 도금 조직을 갖는 도금 강판.
- 제 2 항에 있어서,상기 도금층의 스팽글 크기는 300 내지 500㎛인 미세하고 균일한 도금 조직을 갖는 도금 강판.
- 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,상기 도금층은 표면에 접촉식 가압 냉각 패턴을 가지는 미세하고 균일한 도금 조직을 갖는 도금 강판.
- 제 4 항에 있어서,상기 접촉식 가압 냉각 패턴은, 직조된 천의 형태, 그물 형태 또는 불규칙하게 선이 얽혀있는 형태인 미세하고 균일한 도금 조직을 갖는 도금 강판.
- 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,상기 도금층은 Mg 성분을 더 포함하고,상기 도금층 내에 MgZn2상을 포함하는 미세하고 균일한 도금 조직을 갖는 도금 강판.
- 제 6 항에 있어서,상기 MgZn2상의 (112)/(201) 비율이 0.6 이상으로 형성된 미세하고 균일한 도금 조직을 갖는 도금 강판.
- 제 7 항에 있어서,상기 도금층은 Al 성분을 더 포함하는 Zn-Al-Mg 합금 도금층인 미세하고 균일한 도금 조직을 갖는 도금 강판.
- 제 7 항에 있어서,상기 도금층 두께는 5 내지 50㎛ 인 미세하고 균일한 도금 조직을 갖는 도금 강판.
- 강판을 도금하는 도금 단계, 강판의 도금 부착량을 조절하는 조절 단계, 및 강판을 냉각하는 냉각 단계를 포함하고,상기 냉각 단계는 강판 표면의 도금층에 접촉하는 냉각체로 강판에 냉기를 가하여 강판을 냉각하는 단계, 및 상기 냉각체로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 냉각체를 냉각하는 단계를 포함하는 도금 강판 제조 방법.
- 제 10 항에 있어서,상기 조절 단계는 강판 표면의 도금층에 접촉하는 나이프로 도금 부착량을 일차 조절하는 단계, 및 상기 나이프로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프를 냉각하는 단계를 포함하는 도금 강판 제조 방법.
- 제 11 항에 있어서,상기 조절 단계는, 강판 표면의 도금층에 밀착되는 칠롤로 도금 부착량을 이차 제어하며 강판을 냉각하는 단계, 및 상기 칠롤로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 칠롤을 냉각하는 단계를 더 포함하는 도금 강판 제조 방법.
- 강판을 도금하는 도금 단계, 강판의 도금 부착량을 조절하는 조절 단계, 및 강판을 냉각하는 냉각 단계를 포함하고,상기 조절 단계는 강판 표면의 도금층에 접촉하는 나이프로 도금 부착량을 일차 조절하는 단계, 및 상기 나이프로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프를 냉각하는 단계를 포함하는 도금 강판 제조 방법.
- 제 13 항에 있어서,상기 조절 단계는, 강판 표면의 도금층에 밀착되는 칠롤로 도금 부착량을 이차 제어하며 강판을 냉각하는 단계, 및 상기 칠롤로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 칠롤을 냉각하는 단계를 더 포함하는 도금 강판 제조 방법.
- 제 12 항 또는 제 14 항에 있어서,상기 조절 단계는, 강판에 대한 나이프 또는 칠롤의 접촉 하중을 검출하는 단계, 및 검출된 접촉 하중에 따라 강판에 대한 나이프 또는 칠롤의 가압력을 제어하는 단계를 더 포함하는 도금 강판 제조 방법.
- 제 10 항 내지 제 12항 중 어느 한 항에 있어서,상기 냉각 단계는 강판에 대한 냉각체의 접촉 하중을 검출하는 단계, 및 검출된 접촉 하중에 따라 강판에 대한 냉각체의 가압력을 제어하는 단계를 더 포함하는 도금 강판 제조 방법.
- 제 10 항 내지 제 14 항 중 어느 한 항에 있어서,상기 조절 단계와 냉각 단계는 강판의 이동방향을 따라 강판의 도금층 두께를 점차 줄이는 도금 강판 제조 방법.
- 제 10 항 내지 제 14 항 중 어느 한 항에 있어서,상기 조절 단계 또는 냉각 단계에서 사용된 액체 질소에 의한 배출가스를 열처리로 내 환원가스 또는 냉각 공정의 분위기 유지용 가스로 사용하는 단계를 더 포함하는 도금 강판 제조 방법.
- 제 11 항 내지 제 14 항 중 어느 한 항에 있어서,상기 조절 단계에서, 나이프의 팁부는 -250 내지 5℃의 온도로 유지되는 도금 강판 제조 방법.
- 제 12 항 또는 제 14 항에 있어서,상기 조절 단계에서, 칠롤은 -250 내지 5℃의 온도로 유지되는 도금 강판 제조 방법.
- 제 10 항 내지 제 12 항 중 어느 한 항에 있어서,상기 냉각 단계에서, 냉각체는 -250 내지 5℃의 온도로 유지되는 도금 강판 제조 방법.
- 제 10 항 내지 제 14 항 중 어느 한 항에 있어서,상기 도금 강판은 20℃/sec 이상의 냉각속도로 급냉되는 도금 강판 제조 방법.
- 제 21 항에 있어서,상기 도금 강판은 20℃/sec 이상의 냉각속도로 250℃ 이하의 온도까지 급냉되는 도금 강판 제조 방법.
- 제 21 항에 있어서,상기 냉각 단계에서, 냉각체 표면에 형성된 패턴을 도금층으로 전사하여 도금층 표면에 패턴을 형성하는 단계를 더 포함하는 도금 강판 제조 방법.
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EP16879397.4A EP3396009B1 (en) | 2015-12-24 | 2016-12-23 | Plated steel sheet having fine and even plating structure and plated steel sheet manufacturing method |
US16/064,804 US11168389B2 (en) | 2015-12-24 | 2016-12-23 | Plated steel sheet having fine and even plating structure |
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